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The material X80 grade pipeline steel, where is E = 245 Gpa, σs = 569.5 Mpa.
NJZY14006) , the Natural Science Foundation of Hebei Provincial Education Department, China (Grant No.
Journal of Materials Processing Technology, 2001, 108: 369-375 [2] Thomson P F, Kim J K.
Journal of Materials Processing Technology, 2002, 120(1-3): 348-354 [4] R.Hill.
Springback after the biaxial elastic-plastic pure bending of a rectangular plate—Ⅰ[J].International journal of mechanical sciences,1981, 23: 619-630 [6] T.X.Yu, W.

The material contents of all four formulas are shown by table 1.
Reference: [1] Hongmei An, Jianjun Li: submitted to Journal of.
(In Chinese) [2] Xue Liu: submitted to Journal of Energetic Materials,2000,8(3):35-139.
[4] Zeng Jiaya. submitted to Journal of Journal of Solid Rocket Technology,2002,25(1):46-50.
(In Chinese) [5] Wang Beihai. submitted to Journal of Journal of Solid Rocket Technology,1997,20(3):36-42.

The thickness of viscoelastic layer is h in the y direction, for simplicity, supposing the thickness of elastic materials is infinite by the viscoelastic layer thickness and crack length is very small to the elastic materials scale.
Conclusions (1) The materials tend to failure with the initial crack length increasing
Tong: Composites Science and Technology. 62(2002), p. 1079-1095
Wu: Journal of Thermal Stresses. 19(1996), p. 237-265
The II 0K/pt- curve in the crack-tip of interface between elastic and viscoelastic materials for different materials relaxation time

Friction Stir Welding of Dissimilar Materials with Reinforcement of Copper Particulates Rahul B Dhabale1,a*, Vijaykumar S.
This process cause onion structure because of mixture between two materials and exchanging of the atoms within it with different mechanical properties.
Future scope of work shall be welding of dissimilar materials like steel to aluminium.
Pal, Multi Objective Optimization of Friction Stir Welding Parameters for Joining of Two Dissimilar Thin Aluminum Sheets, Procedia Materials Science 6 (2014) 178-87
Ojo, Metallurgical and mechanical properties of underwater friction stir welds of Al7075 aluminum alloy, Journal of Materials Processing Tech. 262 (2018) 239–256

Journal of Materials Research, 13(4):1049- 1058, 1998
Advanced Materials, 29(19):1700205, 2017
Materials & Design, 109(Supplement C):347 - 353, 2016
Journal of Materials Research, 16(5):1280-1286, 2001
Journal of Materials Research, 14(6):2296-2305, 1999

Abstract.Reinforced soil has been among the most effective soil modification materials.
Clay was used as sub grade material.
The advances of these materials have usually been considered by an increase in their applications.
MATERIAL Composite materials consist of two parts.
REFERENCES [1] Akbulut, S., Arasan, S. and Kalkan, E. (2007) Modification of clayey soils using scrap tire rubber and synthetic fibers, Journal of Applied Clay Science 38, 23-32

IOP Conference Series: Materials Science and Engineering, 709, 044099–. doi:10.1088/1757-899x/709/4/044099 [11] H.
Journal of Materials Processing Technology, 174, 145–154
Engineering Science and Technology, an International Journal, Volume 23, Issue 4, Pages 801-811. doi:10.1016/j.jestch.2020.06.009 [17] S.
IOP Conference Series: Materials Science and Engineering, 402(), 012102–. doi:10.1088/1757-899X/402/1/012102 [18] Mohamed El-Hofy; Mohamed Osama Helmy; Gustavo A Escobar-Palafox; Kevin Kerrigan; R.
Journal of Composite Materials, Vol. 55, Issue 12, Pages 1693-1703. doi.org/10.1177/0021998320974428 [20] N.

On fire-proof paint thickness for steel under transient fire WU Wenzhong College of Energy Science and Engineering, Xi’an University of Science and Technology, China Email: wuwenzhong@tju.edu.cn Keywords: steel structure; fire-proof paint; fire; similarity form.
Journal of Building Structures, 2010, 31 (6): 0110-12 (in Chinese)
Journal of Building Structures, 2004, 25 (3): 0045-07 (in Chinese)
Journal of Building Structures, 2004, 25 (3): 0038-07 (in Chinese)
Journal of HV&AC, 2009, 39 (1): 127-129 (in Chinese)

To begin with, statistics of research journals about learning community of recent three years was made.
All of the teachers are supposed to learn in a group or a community; they are willing to help with each other by sharing teaching materials and resources online.
Table1, Statistics about the Journals of Learning Community Based on CNKI from 2011 to 2013.
It is high time to establish resources database, not only including course materials and knowledge database, but also teachers’ self-made resources, such as PPT, teaching plan, sound materials uploaded to be shared with in the community.
Acknowledgements This work is financially supported by the Science and Research Department of my work unit.

Calculating the amount of the environmental impact of all materials spends a big labor.
The evaluation concretely gives LEED of USA to "Nearby materials are used".
Table 2 showed the elasticity modulus concerning some construction materials.
The elasticity of other main materials was 0.06 or less.
ii) Display the use ratio such as emphasized raw materials clearly.